Subtyping of an enum

[XavierAP]

On Monday, 15 April 2019 at 12:38:59 UTC, XavierAP wrote:
>
> More generally you insist on modules and namespaces to be 
> different concepts, which they are (pointlessly) for C++, but 
> not for D (purposely).

Here I should say packages instead of modules... but the general 
argument stays.

Anyway your design is up to you :) but sub-typing is not 
reflexive, in D or any language.